Just in time for Halloween is this skull throwie.
I used a quick and dirty approach to prep this model from 3dcool.net for printing using blender. you will most likely want to tweak the model for higher quality since this was intended as a test.
Tape two leds to a lithium battery (CR2032 or similar)
Affix to bottom of skull using hot glue or more tape.
Feed the protruding leds through the eye sockets.
Add a magnet and chuck at any ferrous surface.